The Battle of Arica, also known as Assault and Capture of Cape Arica, was a battle in the War of the Pacific. It was fought on 7 June 1880, between the forces of Chile and Peru.

After the Battle of Tacna and the following Bolivian withdrawal from the war, Peru had to stand alone for the rest of the conflict. The need for a port near to the location of the army, in order to supply and reinforce the troops and evacuate wounded, made the Chilean command put its attention on the remaining Peruvian stronghold in the Tacna Department. The Chilean army, led by Colonel Pedro Lagos, launched a giant assault to Arica, where the 1600 men of the defense fought more than 8000 Chileans, from sea and land, who finally captured the Morro de Arica (English: Cape Arica) after 55 minutes of combat. The defending Peruvian troops under the command of Colonel Francisco Bolognesi died as heroes. In this fight the old Peruvian Commander died along with several officers and more than 1,000 men.

The Chilean victory ended the phase of the conflict known as Campaña de Tacna y Arica (English: Campaign of Tacna and Arica), resulting in the occupation of the entire Tarapacá and Tacna provinces. After this action, a new stage began named Campaña de Lima (English: Lima Campaign), which concluded with the fall of the Peruvian capital city seven months later.

The city of Arica never returned to Peruvian hands. It was temporarily ceded to Chile after the signing of the Treaty of Ancon, on 1884; the city remained occupied by Chilean forces until the later signing of the Treaty of Lima in 1929, when it was ceded permanently to Chilean sovereignty.